Smart Contract Developer

Smart Contract Developer – London

Reference Code: 479134-

Contract Type:
Permanent

Professional Communities:
Products & Systems Engineering

Lead the design and delivery of enterprise‑grade blockchain solutions within regulated financial environments. This role focuses on smart contract engineering, tokenised securities, digital cash integration, and secure, compliant DLT platforms for capital markets, payments and settlement systems.

The places that you work from day to day will vary according to your role, your needs and those of the business; it will be a blend of company offices, client sites and your home; noting that you will be unable to work at home 100 % of the time.

• Design and implement distributed ledger solutions for
  • Capital markets
  • Payments
  • Custody and settlement systems
• Deliver production‑grade blockchain systems for
  • Banks
  • Financial Market Infrastructures (FMIs)
  • Exchanges and regulated fintechs
• Integrate on‑chain logic with off‑chain enterprise systems
  • Core banking platforms
  • Central Securities Depositories (CSDs)
  • Payment rails
  • Regulatory reporting systems

• Develop, test, audit and deploy secure Solidity‑based smart contracts
• Implement advanced contract logic for
  • Asset issuance, transfer and redemption
  • Lifecycle event management
  • Settlement workflows (DvP, escrow, atomic swaps)
• Design and implement
  • Token standards (fungible, NFT, hybrid securities)
  • Gas‑optimised smart contract architectures
  • Upgradeable contract patterns

• Build and manage tokenisation frameworks for
  • Securities and financial instruments
  • Tokenised assets across lifecycle stages
• Work with digital cash instruments
  • Stable coins
  • Tokenised bank deposits
  • On‑chain cash leg representations for DvP
• Ensure compliance with regulatory requirements for on‑chain financial products

• Work across both public and permissioned DLT platforms
  • Ethereum
  • Hyperledger Besu
  • Corda
• Apply enterprise blockchain standards for
  • Privacy
  • Interoperability
  • Tokenised securities markets

• Ensure secure smart contract design by addressing
  • Reentrancy attacks
  • Access control vulnerabilities
  • Precision/overflow issues
• Design custody and wallet solutions using
  • MPC (Multi‑Party Computation)
  • HSM‑backed signing
  • Policy‑based wallet controls
• Implement privacy‑preserving mechanisms
  • Permissioned access models
  • Selective disclosure
  • Zero‑knowledge proof (ZKP) concepts

• Build and deploy cloud‑native applications on
  • AWS, Azure or GCP
• Operate containerised systems using
  • Kubernetes
  • Microservices architectures
• Implement Dev Sec Ops  practices
  • CI/CD pipelines for smart contracts and backend services
  • Automated testing and security scanning
  • Infrastructure as Code (IaC)
• Ensure production reliability through
  • Monitoring (Prometheus, Grafana)
  • Observability frameworks
  • Secure secrets and key management

• 12+ years of software engineering experience
• 4–6+ years of hands‑on smart contract development
• Proven experience in regulated environments (banks, FMIs, exchanges, fintechs)
• Strong exposure to capital markets and post‑trade systems

• Solidity smart contract development (advanced level)
• Ethereum, Hyperledger Besu, Corda
• Token standards (ERC‑20, ERC‑721, ERC‑1155, hybrid models)
• Smart contract lifecycle management

• Securities lifecycle management
• Clearing and settlement processes
• Corporate actions and custody
• Delivery vs Payment (DvP) mechanisms

• Smart contract security best practices
• MPC, HSM and wallet architecture
• Zero‑knowledge proofs (ZKP)
• Selective disclosure and privacy‑preserving architectures

• Core banking integration
• Payment systems and rails
• Regulatory reporting platforms
• Hybrid on‑chain/off‑chain architectures

Capgemini is proud to be a Disability Confident Employer (Level 2) under the UK Government’s Disability Confident scheme. We offer an interview to all candidates who declare a disability and meet the minimum essential criteria for the role.